quick frontend (widgets): added "widget_hash" helper property

sat_frontends/quick_frontend/quick_widgets.py

@@ -373,6 +373,11 @@ class QuickWidget(object):
         """
         return next(iter(self.targets))
 
+    @property
+    def widget_hash(self):
+        """Return quick widget hash"""
+        return self.getWidgetHash(self.target, self.profiles)
+
     # synchronisation state
 
     @property